|MadSci Network: Physics|
At home, I have got an astonishing little toy that appearantly violates energy conservation. A "bird" consists mainly of a glass tube which has a liquid reservoir at its lower end. Its upper end (head)is made of a porous material. When the head is weted with some water, the liqiud level in the tube starts to raise an evenually the whole bird tilts and takes another sip. So, the bird keeps on moving on and on. (Sorry, I find it quite difficult to describe the bird but maybe it is well know. Otherwise I can send a picture.) How can the evaporating water produce low pressure and thus make the inner liquid raise ?
Re: How does the 'drinking bird' toy work ?
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